calculator.org

the calculator home page

Keystone 2040

The Keystone 2040 is an arithmetic calculator with algebraic logic. It has a VFD (vacuum fluorescent) display. The power source is Sealed battery pack.

Facts at a glance:

FeatureValue
TypeArithmetic
LogicAlgebraic
Display typeVFD
Length152mm
Width81mm
Power SourceSealed battery pack
Year introduced1975

Replacements:

If you have a Keystone 2040 that is no longer working, you can consider replacing the calculator with a modern equivalent. We suggest the following current models as possible replacements:

See other calculators by Keystone